Custom check boxes not displaying

Is anyone having trouble with their custom check boxes?

Mine were working fine for months, but have suddenly stopped displaying properly. As far as I know, I’ve not actually changed anything so I have no idea why would they stop displaying as they did before, and I can’t work out how to revert to how they were. Nothing I’m doing is changing them.

I include an image that’s close to how they used to work (with the green ticks).

Here is my site Read-Only:

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